1. Add 1 sachet descaling salt for hot water dispensers with water and mix. 2. Pour the mixture of water and descaler into the tank up to the "MAX" indication. 3. Wait until the lime is detached. 4. Drain the dirty water. 4. To drain the dirty water to open the tap and rinse with clean water until the smell and taste are completely gone. 5. The unit is now ready for use again. Please note that the warranty does not apply to devices that are hardly functioning because they are not decalcified.